<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <button id="btn">按钮</button>
    <script>
        const btn = document.getElementById('btn');
        // async 异步事件执行函数 存放在 event loop 池子里
        // js 是 事件驱动的语言
        btn.addEventListener('click', () => {
            console.log('BTN GO1');
        })
        btn.addEventListener('click', () => {
            console.log('BTN GO2');
        })
        console.log('console.log');
    </script>
</body>

</html>